You've got some radioactive isotopic that can spontaneously decay into some other nucleus.
我们有一些放射性同位素，这些同位素会自发变成其他的原子核。
The trick they used to do this was to look at the isotopic composition of the oxygen in the wood of local trees.
他们所使用的办法是观测当地树木的木材中的氧同位素组成（isotopic composition）。
The variations in isotopic ratios take place on the right time scale, and they mirror those seen in modern corals, he notes.
他说，同位素比例变化所发生的时间范围恰到好处，这与在现代珊瑚中的发现保持了一致。
While initial research was aimed at looking at seasonal variations in diet, the isotopic tests pointed them instead to apparent gender variations.
虽然初始的研究是为了确定其食物随季节的变化，同位素测试让他们发现了明显的性别差异。
This system can determine 13 isotopic peaks by single beam method.
该系统使用单束法能测定13个同位素峰。
The isotopic signatures of most ancient limestones indicated the same process .
大多数古代石灰岩的同位素特征说明了同样的过程。
Evidence from isotopic dating suggests that the greenstone belts vary considerably in age.
来自同位素年龄鉴定的证据指出，绿岩带在年龄上彼此变化相当大。
Lead isotopic tracing is one of the most prospective methods in environmental geochemistry.
铅同位素示踪技术是环境地球化学中极具发展前景的研究手段之—。
On-Line measurement of solid content in aluminium hydroxide slurry by isotopic densitometer.
应用同位素密度计在线测量氢氧化铝料浆的固体含量。
The isotopic compositions of reference materials are basic parameters for isotopic measurement.
同位素参考物质的同位素组成是同位素测量的基本参数。
Many important achievements have been obtained in application of isotopic hydrology technology.
至今同位素水文技术已获得许多项重要成果。
The isotopic dating and fossil geochronometry are the basic methods of ophiolite geochronometry.
同位素测年及化石年代学法是蛇绿岩年代学研究的基本方法。
This instrument can be used for gas analysis and determine of isotopic abundance of light elements.
此仪器可用于气体分析以及轻元素的同位素丰度测定。
Isotopic trace injection profile logging theory is based on isotopic tracer measurement technology.
同位素示踪注水剖面测井的理论基础是同位素示踪测量技术。
Meanwhile, the isotopic and inclusion data show that mineralizing solution is mainly meteoric water.
同位素和包体资料表明成矿溶液主要为大气降水。
Stable isotopic method can be used effectively in the diagenetic research of deep water carbonate rocks.
稳定同位素方法可以有效地应用于深水碳酸盐岩的成岩作用研究。
We have studied the influence of laser linewidth on ionized efficiency and selectivity of isotopic atoms.
分析了激光线宽对同位素原子激发电离效率和选择性因子的影响。
The Mars methane's specific isotopic makeup could reveal whether its origins are biochemical or geological.
火星甲烷的特定同位素组成能揭示它的来源是生物化学活动还是来自于地质化学过程。
This paper, combined with previous data, briefly summarizes the results of isotopic studies of these deposits.
本文结合前人的资料，对这些矿床的同位素研究成果作一概括性总结。
In the model, isotopic exchange probability is variable and other parameters come from reference or experiment.
模型中的气-固相同位素交换几率为可变参数，其余参数使用了文献值或实验值。
Being a noble gas, it resists chemical bonding with other elements and is thus easy to purify for isotopic analysis.
由于氙是惰性的，不易与其他元素产生化学键，因此很容易纯化以进行同位素分析。
However, contrary to previous views, there is no isotopic evidence that Archaean rocks are present in the Mashan Complex.
然而，与以前的认识相反，麻山杂岩不存在具有太古宙基底的同位素证据。
NP-type chelate resin beads is used as a carrier of samples in the isotopic measurements of uranium by mass spectrometry.
研究了NP型螯合树脂珠作为质谱样品载体，对铀同位素进行热电离质谱分析的方法。
Noble gas isotopic geochemistry is a useful tool for studying on mantle degassing and evolution of the Earth's atmosphere.
惰性气体同位素地球化学是研究地幔脱气作用和地球大气形成与演化的有效工具。
The measurement methods of uranium concentrations in irradiated fuels by isotopic dilution mass spectrometry are described.
介绍了用同位素稀释质谱法测量辐照元件铀含量的方法。
By comparing with relevant results, it can be found that the kinetic isotopic effects of the reaction are relatively obvious.
通过对相应结果的对比，可以发现这个反应具有比较明显的同位素效应。
The article summed isotopic tracing characteristics, and reviewed its applied progress and tendency in above-mentioned fields.
文章综述了同位素示踪技术在上述方面的应用现状和发展趋势。
The information of stable isotopic aging is the important basis for the deep structures, mineralization and chronostratigraphy.
稳定同位素测年信息，是深部构造、成矿作用和地层年代学的重要依据。
The information of stable isotopic aging is the important basis for the deep structures, mineralization and chronostratigraphy.
稳定同位素测年信息，是深部构造、成矿作用和地层年代学的重要依据。
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